Revert "Button & keyboard backlight brightness adjustment (1/2)"

This reverts commit e762e915ec85006eb61abe777f3b83d6279c1ea1.

Conflicts:
	res/layout/button_backlight.xml
	res/layout/keyboard_backlight.xml
	res/values/cm_strings.xml
	src/com/android/settings/cyanogenmod/BootReceiver.java
	src/com/android/settings/cyanogenmod/ButtonBacklightBrightness.java
	src/com/android/settings/cyanogenmod/ButtonSettings.java
	src/com/android/settings/cyanogenmod/KeyboardBacklightBrightness.java